Practica odontologica最新文献

A study was conducted to evaluate the ability of a dental rinse to remove dental plaque. The hypothesis was tested that plaque, as a complex soil comprising microorganisms, cell debris, salivary deposits and other ill-defined organic and inorganic components, would be susceptible to removal by a rinse with high detersive action. A rinse was prepared based on the principles applied to formulation of products for cleansing biologic surfaces, including anionic and nonionic surfactants, sodium benzoate, and auxiliary cleansing agents. Subjects randomly selected from a dental clinic population were scored for plaque area on the lingual and buccal surfaces of the Ramfjord teeth using the Turesky modification of the Quigley-Hein Index. The subjects then rinsed 30 seconds with 15 ml of product, and stainable plaque area was scored again. The rinsing reduced average plaque scores by an average of 13-20%, a very high level of significance. A placebo rinse and a conventional mouthwash removed 2.0% and 1.3% stainable plaque, respectively. The experimental rinse substantially Increased the number of surfaces that were totally free of plaque.

Two dental cleansing products, Rc-Prep and Largal Ultra, were subjected to a comparative study, evaluating their efficacy in vitro on 15 recently-extracted dentary units, through optic microscopy applied on the dentine wall of the instrumented root canal. Both materials were applied on separate hemisections of the canal during 15 minutes intervals, with two applications on each canal. Rc-Prep was observed to have a slight, not significant advantage over Largal-Ultra in its cleansing effect over the dentine smear, although the compact, granular and amorphous layer of dentine smear over the root canal wall, blocking the entry to dentine channels, persisted after use of both products. In view of conditions observed in the dentine walls, the authors assume that adhesion and adaptation of obturating materials over these structures is exceedingly difficult. Although variability was not considered as is usual in clinical studies, in vitro evaluation as observed in this study allows a more accurate comparative analysis, since it was performed on one individual tooth, with analogous instrumentation and on dentary tissue with similar characteristics.

Unlabelled: As observed, the problem of lining and accommodation of teeth in the child population is increasingly larger. This fact prompted the authors to attempt determining the prevalence of cross-bite in a sample of Mexican children. A total of 306 patients, aged between two and 17 and attending the Stomatology service of the National Institute of Pediatrics, were evaluated, from which all pertinent data regarding age, sex, molar-temporal relationship (terminal, rectus, distal, messial and exaggerated messial planes), permanent molar status (Angle I, II, III), cross-bite, type of dentition affected (primary, mixed or permanent), cross-bite classification (anterior, posterior or mixed), whether unilateral, bilateral, dental or skeletal, right or left, and number of teeth affected, were duly recorded.

Results: Out of 306 evaluated patients (160 males, 146 female), 112 evidenced cross-bite (36.6%), 56 of each sex; in 69.6% the teeth were anterior, in 17.8% they were posterior, and in 15.5% their position was mixed. Their average age was 8 years, and malocclusion was Angle class I. From this experience, it is to be concluded that early detection and correction of any dental occlusion abnormality will permit correcting defects in dentofacial development; it is thus necessary to ascertain the frequency of cross-bite.

Ever since its initial outbursts in high-risk groups, AIDS has had an appalling impact within the oncological sphere, since it combines opportunistic pathologies with the occurrence of malignancies caused by loss of defensive cells, thus allowing abnormal or cancerous cells to multiply. This paper conveys some recent concepts on AIDS, as well as a study undertaken at the "20 de Noviembre" Hospital, aimed at identifying the most common opportunistic diseases which often occur in the oral cavity upon contracting AIDS.

Research on the resistance to compression and creeping in high-copper amalgam alloys is important, as it may serve as a basis for analyzing their properties, from which their clinical behavior may be verified. In this study, resistance to compression, as well as to creeping, was investigated in three different brands of high-copper amalgam alloys, for a period of one hour and then for seven days. Specimens of each alloy were prepared in compliance with Specification Number 1 set forth by the ADA.

Taking into account the importance of the teaching-learning process, Multiple Linear Regression was used to measure the degree of learning attained by 470 students in 12 biochemical subjects, under nine professors from four different training areas: chemistry, biology, medicine and dentistry. In the 17 student groups (nine in the morning shift, eight on the evening schedule), significant differences were found in the biochemical subjects under study (p = 0), among the nine individual professors (p = 0), between the morning vs. evening shift students (p = 0.014) and between the 17 student groups (p = 0.04). No significant differences were observed in professors within each of the four different teaching areas (p = 0.27).

In the treatment of leukemia (whose viral etiology has not yet been established), certain drugs show a significant oral toxicity, sometimes manifested in the form of pain, an often as superficial white, red-bordered patches in the gums, labial mucosa, palate and pharynx, among other locations. It is, therefore, important for the odontologist to be conscious of leucemic manifestations, as well as interested in assuming an active role when caring for patients subjected to treatment for this malady.